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Re: Diagnostics for missing libraries in DSOs
- From: Florian Weimer <fweimer at redhat dot com>
- To: Andreas Schwab <schwab at suse dot de>
- Cc: Binutils <binutils at sourceware dot org>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Mon, 22 Aug 2016 17:06:18 +0200
- Subject: Re: Diagnostics for missing libraries in DSOs
- Authentication-results: sourceware.org; auth=none
- References: <firstname.lastname@example.org> <email@example.com>
On 08/22/2016 04:53 PM, Andreas Schwab wrote:
On Aug 22 2016, Florian Weimer <firstname.lastname@example.org> wrote:
Currently, it is extremely easy to produce a DSO which links against
compat symbols at run time: Just omit a required DSO when invoking the
static linker. As a result, the symbol reference in the created DSO will
lack a version, and will be bound to a compat symbol at run time:
This is very difficult to diagnose properly. It can also lead to current
binaries reintroducing historic bugs which we did not want to push on
applications for backwards compatibility reasons.
What can we do here? Can we provide a diagnostic at static link time?
ld --no-allow-shlib-undefined would turn them into errors.
Interesting, this does look helpful.
Would it work in practice? Could you build a distribution with this option?